Obama, Calderon talk of anti-cartel action

MEXICO CITY 
President Barack Obama and Mexican President Felipe Calderon are pledging to work together on challenges confronting both countries.

A main focus for Obama is the battle against the Mexican drug cartels, and the drug-related violence plaguing the border region. He says it isn't just Mexico's problem to solve. He says the United States needs to work against the demand for drugs from Mexico, and against the flow of guns into Mexico.

Obama wants the U.S. Senate to ratify a treaty that he said would limit the number of those weapons going to Mexico.

Obama said at a news conference Thursday in Mexico City that he and Calderon also spoke in their meeting about reducing greenhouse gas emissions and improving their economies.